SB20260428150 - Confluence Data Center update for valibot

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Main Vulnerability Database SB20260428150

SB20260428150 - Confluence Data Center update for valibot

Published: April 28, 2026

Security Bulletin ID SB20260428150
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Inefficient regular expression complexity (CVE-ID: CVE-2025-66020)

CWE-ID: CWE-1333 - Inefficient Regular Expression Complexity

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to inefficient regular expression complexity in EMOJI_REGEX used by the emoji action when processing user-controllable input. A remote attacker can submit a specially crafted short string to cause a denial of service.

The issue is caused by catastrophic backtracking due to overlapping character classes in the regex pattern.


Remediation

Install update from vendor's website.

References